[cfe-dev] New contributor, `make test` not doing anything

[Sidney San Martín via cfe-dev]

(Reposted from llvm-dev)

I came to the recent LLVM/Clang hackathon and made a new checker for
clang-tidy. I'm working on wrapping up and submitting my patch, and I can't
seem to run the tests.

- First, I followed the instructions at
http://clang.llvm.org/hacking.html#testingNonWindows. I ran `make test` in
my build directory, and also tried running `make` in the `test`
subdirectory. They both exited in under a second with no output.

- Then, I tried doing the same thing in the `tools/clang/tools/extra`
subdirectory of my build directory, where clang-tidy lives. Same result.

- Finally, I found http://clang.llvm.org/extra/clang-tidy/#testing-checks.
This explains how to create tests but not how to run them. I made a
relatively wonky command line that seems to run my test successfully (along
the lines of `PATH=$PATH:$BUILD_DIR/bin ./check_clang_tidy.py
../../test/clang-tidy/misc-my-check.cpp misc-my-check /tmp/foo.tmp`), but
it doesn't feel right.

What should I be doing instead?
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